1. crusted, encrusted, crusty, crustlike, covered (vs. bare)

usage: having a hardened crust as a covering

2. crusty, curmudgeonly, gruff, ill-humored, ill-humoured, ill-natured (vs. good-natured)

usage: brusque and surly and forbidding; "crusty remarks"; "a crusty old man"; "his curmudgeonly temper"; "gruff manner"; "a gruff reply"

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See also: crusty (Dictionary)